RT info:eu-repo/semantics/bachelorThesis
T1 Avances sobre el control biológico de Dactylopius opuntiae.
A1 Perestelo Paz, David
K1 Plagas-Control biológico
K1 Plantas-Enfermedades y plagas
K1 Cochinilla
AB The present work, "Advances on the biological control of Dactylopius opuntiae", dealswith the contact for the development of a biological control by conservation, inaccordance with the European guidelines for the reduction of phytosanitary productsand the European green pact, and therefore different approaches were carried out toachieve this biological control:Firstly, the survey of natural enemies of the insect pest on the island of Tenerife,carried out in ten different geographical locations where the presence of thecoccinellids Parexochomus nigripennis and Cryptolaemus montrouzieri has beenconfirmed, specifically in four and three of the surveyed areas, respectively. Inaddition, an encyrtid of the species Homalotylus nigricornis, a hyperparasitoid of P.nigripennis larvae, was also captured.Secondly, two laboratory tests were carried out. In the first one, the predation rate ofC. montrouzieri was measured on different plant material, with different stages (L4and adult), offering the two species Dactylopius coccus or Dactylopius opuntiae. Nosignificant differences were detected between the different interactions of the plantmaterial with the stages and prey offered, but larvae were more predatory thanadults.Thirdly, a field trial was carried out on a farm in the municipality of Fasnia, wheretunera is exploited to obtain fruit, to measure the percentage of effectiveness andsurvival of C. montrouzieri. Although the circumstances of a heat wave affected theexperiment, the trial detected significant differences in the infestation of the controlcladodes and those where the coccinellid was released.Fourthly, the predation rate of P. nigripennis and C. montrouzieri was compared andthe predation rate of the carmine mealybug was significantly lower for P. nigripennisthan for C. montrouzieri.It is concluded that the study presented possible solutions to this pest. The viable useof P. nigripennis in carmine mealybug farms where the wild mealybug is a problem,after a better knowledge of the insect; and the application of C. montrouzieri as ashort-term agent against the pest Dactylopius opuntiae where the fruit of the tunera isobtained.
YR 2022
FD 2022
LK http://riull.ull.es/xmlui/handle/915/29998
UL http://riull.ull.es/xmlui/handle/915/29998
LA es
DS Repositorio institucional de la Universidad de La Laguna
RD 29-nov-2024